Actor Matthew McConaughey customized his 2004 Airstream International CCD 28 with a practical mind-set. “If it looks good but it’s not functional, then it’s not worth anything,” he says.

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The trailer is parked in Malibu, with “surfing right down the street.”

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A poster for McConaughey’s upcoming movie, Surfer, Dude, hangs above his banquette in the living area.

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The actor, who keeps a number of journals, also uses the Airstream as office space for j.k. livin, his music, production and clothing company.

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A journal and a photo album document his mid-1990s African trip to meet Ali Farka Toure, a musician known as the “bluesman of Africa.”

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McConaughey removed a picnic-style table and had a craftsman in Louisiana build him a more traditional model. Low stools that slide under it free additional space in the living area. “An immobile seat takes up precious square footage,” he says.

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“It’s two seconds from making your bed to putting your coffee on the stove,” McConaughey remarks.

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“It’s just a really cozy place to sleep,” he says of his bedroom, which he nicknamed the Honeycomb because of its rounded ceiling.

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“The thing about small spaces is that they’re relaxing,” says McConaughey. “You’re limited in your options.” He is now customizing two more Airstreams.